Impulse radar, also known as non-career radar and video pulse radar, is a branch or a special case of the Ultra Wide Band (UWB) radar.
冲击脉冲雷达，又称作无载波雷达和视频脉冲雷达，是超宽带雷达的一个分支和特例。
ADSL is a branch of DSL technology, but also the use of ordinary telephone lines to transmit data, but it is used in high frequency band than the voice.
ADSL是DSL技术的一个分支，同样也是使用普通电话线路来传输数据，但它使用的频率要比语音波段高。
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